diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6fef8a1..e84fff6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,13 +13,19 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [7.2, 7.3, 7.4, 8.0, 8.1]
-        laravel: [^7.0, ^8.0]
+        php: [7.2, 7.3, 7.4, '8.0', 8.1]
+        laravel: [7, 8, 9]
         exclude:
           - php: 7.2
-            laravel: ^8.0
+            laravel: 8
+          - php: 7.2
+            laravel: 9
+          - php: 7.3
+            laravel: 9
+          - php: 7.4
+            laravel: 9
           - php: 8.1
-            laravel: ^7.0
+            laravel: 7
 
     name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }}
 
@@ -37,7 +43,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          composer require "illuminate/contracts=${{ matrix.laravel }}" --no-update
+          composer require "laravel/framework=^${{ matrix.laravel }}" --no-update
           composer update --prefer-dist --no-interaction --no-progress
 
       - name: Execute tests
diff --git a/composer.json b/composer.json
index 2fc3091..84fc524 100644
--- a/composer.json
+++ b/composer.json
@@ -13,21 +13,21 @@
         "php": "^7.2|^8.0",
         "ext-dom": "*",
         "ext-json": "*",
-        "illuminate/contracts": "^7.0|^8.0",
-        "illuminate/database": "^7.0|^8.0",
-        "illuminate/http": "^7.0|^8.0",
-        "illuminate/support": "^7.0|^8.0",
-        "illuminate/testing": "^7.0|^8.0",
+        "illuminate/contracts": "^7.0|^8.0|^9.0",
+        "illuminate/database": "^7.0|^8.0|^9.0",
+        "illuminate/http": "^7.0|^8.0|^9.0",
+        "illuminate/support": "^7.0|^8.0|^9.0",
+        "illuminate/testing": "^7.0|^8.0|^9.0",
         "mockery/mockery": "^1.0",
         "phpunit/phpunit": "^8.5|^9.0",
-        "symfony/console": "^5.0",
-        "symfony/css-selector": "^5.0",
-        "symfony/dom-crawler": "^5.0",
-        "symfony/http-foundation": "^5.0",
-        "symfony/http-kernel": "^5.0"
+        "symfony/console": "^5.0|^6.0",
+        "symfony/css-selector": "^5.0|^6.0",
+        "symfony/dom-crawler": "^5.0|^6.0",
+        "symfony/http-foundation": "^5.0|^6.0",
+        "symfony/http-kernel": "^5.0|^6.0"
     },
     "require-dev": {
-        "laravel/framework": "^7.0|^8.0"
+        "laravel/framework": "^7.0|^8.0|^9.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/tests/Stubs/OutputStub.php b/tests/Stubs/OutputStub.php
index 1ccd08b..f1fd6f5 100644
--- a/tests/Stubs/OutputStub.php
+++ b/tests/Stubs/OutputStub.php
@@ -19,31 +19,36 @@ public function setVerbosity($level)
     {
     }
 
-    public function getVerbosity()
+    public function getVerbosity(): int
     {
+        return 1;
     }
 
-    public function isQuiet()
+    public function isQuiet(): bool
     {
+        return false;
     }
 
-    public function isVerbose()
+    public function isVerbose(): bool
     {
+        return false;
     }
 
-    public function isVeryVerbose()
+    public function isVeryVerbose(): bool
     {
+        return false;
     }
 
-    public function isDebug()
+    public function isDebug(): bool
     {
+        return false;
     }
 
     public function setDecorated($decorated)
     {
     }
 
-    public function isDecorated()
+    public function isDecorated(): bool
     {
     }
 
@@ -51,7 +56,7 @@ public function setFormatter(OutputFormatterInterface $formatter)
     {
     }
 
-    public function getFormatter()
+    public function getFormatter(): OutputFormatterInterface
     {
     }
 }